Proserpinaca is a genus of aquatic plants belonging to the family Haloragaceae. These plants are commonly found in freshwater environments, such as ponds and lakes, primarily in North America and parts of South America. They are characterized by their submerged leaves, which are often finely divided, and their ability to thrive in various water conditions. The most well-known species within this genus is Proserpinaca palustris, often referred to as the marsh mermaid weed. This plant plays a vital role in aquatic ecosystems by providing habitat and food for various aquatic organisms. Additionally, it is sometimes used in aquariums for its aesthetic appeal and ability to improve water quality.